I used them a couple of times but I've got some medical issues that are making my feet get colder and colder, I'm going to need some sort of boot heaters before very long or maybe just wear pacs. Anyway, here's the link to the product: http://mountaintools.com/cat/techwear/G ... aiters.htm and mine are XL, they fit a Lowa Trekker 11.5 really well. How about $55 shipped to you CANUS?